package com.pattern.Iterator;

/**
 * 具体的迭代器类
 */
public class BookShelfIterator implements Iterator {

    private BookShelf bookShelf;
    private Integer index;

    public BookShelfIterator(BookShelf bookShelf) {
        this.bookShelf = bookShelf;
        this.index = 0;
    }

    public boolean hasNext() {
        return index < bookShelf.getLength();
    }

    public Object next() {
        Book book = bookShelf.getAt(index);
        index++;
        return book;
    }
}
